Simplicio: Hey I’ve got an alignment research idea to run by you.

Me: … guess we’re doing this again.

Simplicio: Interpretability work on trained nets is hard, right? So instead of that, what if we pick an architecture and/or training objective to produce interpretable nets right from the get-go?

Me: If we had the textbook of the future on hand, then maybe. But in practice, you’re planning to use some particular architecture and/or objective which will not work.

Simplicio: That sounds like an empirical question! We can’t know whether it works until we try it. And I haven’t thought of any reason it would fail.

Me: Ok, let's get concrete here. What architecture and/or objective did you have in mind?

Simplicio: Decision trees! They’re highly interpretable, and my decision theory textbook says they’re fully general in principle. So let's just make a net tree-shaped, and train that! Or, if that's not quite general enough, we train a bunch of tree-shaped nets as “experts” and then mix them somehow.

Me: Turns out we’ve tried that one! It's called a random forest, it was all the rage back in the 2000's.

Simplicio: So we just go back to that?

Me: Alas [...]

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First published:
November 21st, 2025

Source:
https://www.lesswrong.com/posts/2HbgHwdygH6yeHKKq/why-not-just-train-for-interpretability

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Narrated by TYPE III AUDIO.

Why Not Just Train For Interpretability?

LessWrong (30+ Karma)